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What is the S.I. unit of electric potential difference?

What happens when light enters a glass slab from air?

The method of protecting iron from rusting, by coating a thin layer of Zinc is called -

Which of the following represents the correct electronic configuration of nitrogen ?

If ice floating on water in a vessel melts, the water level in the vessel     .

Which one of the following oxides reacts with both acid and base?

Which of the following pair of microorganisms is correct?

I. Spirogyra – Algae

II. Amoeba – Fungi

Which is the longest bone in the human body?

An aircraft can perform aerobatic manoeuvres in a vertical loop because of-

The refractive index of water and turpentine oil are 1.33 and 1.47, respectively. A ray of light travels from